a diferença entre ímanes N35 e N55

Qual é a diferença entre os ímanes N35 e N55?

When working with neodymium magnets, you’ll notice they have a grade designation like N35 or N55. This refers to the strength rating of the magnets. But what do these numbers actually mean and how do they(N35 and N55 Magnets) compare?

a diferença entre ímanes N35 e N55

Understanding Neodymium Magnet Grades

The “N” stands for neodymium, indicating a neodymium iron boron (NdFeB) magnet. The number following is the produto de máxima energia rating, given in units of Mega Gauss Oersteds (MGOe). This number correlates with how strong the magnetic field will be.

In practical terms, a higher number means a stronger magnet. For example:

  • N35 magnets have a maximum energy product rating of 35 MGOe
  • N55 magnets have a maximum energy product of 55 MGOe

So N55 magnets with the same dimensions as N35 magnets will have a noticeably stronger magnetic field. The key difference lies in the magnetic performance.

Magnetic Performance Comparison Between N35 and N55

When comparing N35 and N55 magnets, there are a few key areas where their magnetic performance differs:

1. Magnetic Field Strength

The magnetic field strength of a neodymium magnet depends on its grade and dimensions.

Given the same size and shape, N55 magnets have a stronger magnetic field than N35 magnets. For example, a 1″ x 1″ x 1″ cube N35 magnet might have a field strength of 5000 Gauss on its surface. A similar N55 cube magnet can achieve over 6000 Gauss.

This also means that an N35 magnet would need to be physically larger than an N52 magnet to achieve an equivalent magnetic field strength in most applications.

2. Temperature Resistance

Another major difference lies in the maximum operating temperatures.

N35 magnets have a maximum operating temperature of 80°C (176°F) while standard N55 magnets can only operate up to 60°C (140°F) before starting to lose magnetism.

So in applications where magnets will be exposed to higher temperatures, N35 magnets would retain full magnetic strength for a longer period before eventual demagnetization.

3. Pull Force

The pull force describes how strongly the magnets will attract to steel or other magnets. This tends to correlate with the magnetic field strength.

So for the same magnet size and shape, N55 magnets exhibit a stronger pull force than N35 grade neodymium magnets.

However, if the N35 magnet was physically larger than the N55, it could match or even exceed the pull force while costing less due to lower material grades.

4. Cost and Availability

One advantage of lower grade N35 neodymium magnets lies in cost savings. The starting raw material and processing is less expensive compared to premium N55 stock.

Also, N35 magnets have become the baseline grade for many manufacturers. They maintain sufficient inventory to meet demand. On the other hand, high performance N55 magnets may see supply limitations. This can increase cost and lead times.

When to Choose N35 or N55 Grade Magnets

With an understanding of the performance differences, when should you opt for affordable N35 magnets or premium N55 options?

N35 Magnets Ideal For:

  • Cost-sensitive projects – Get sufficient strength at the lowest price point
  • Basic holding and alignment applications
  • Assemblies using multiple magnets
  • Operating environments up to 80°C
  • Applications not requiring maximum magnetic performance

N55 Magnets Well-Suited For:

  • Precision equipment where field strength consistency and quality is critical
  • Devices with small installation spaces where magnet volume is very constrained
  • Assemblies using heat sinks, fans or thermal adhesives to control temperatures
  • Holding very heavy loads in place securely
  • Scientific test equipment requiring highest magnetic flux density

So if your project has unlimited budgets or requires sheer magnetic power from miniature components, high-end N55 magnets would be the best choice.

For more cost-conscious applications not pushing the limits of magnetic technology, affordable N35 magnets may prove suitable and economical.


Understanding neodymium magnet grades like N35 and N55 provides great insight into material selection for a project. While higher numbers guarantee increased performance, lower cost options can satisfy requirements for many common applications. Consider all aspects including temperature needs, available space, load sizes, and budget when deciding between affordable N35 or high-performance N55 magnets.

Perguntas mais frequentes

Posso utilizar ímanes N35 e N55 em conjunto?

Sim, ter ímanes de diferentes graus na mesma montagem é perfeitamente aceitável na maioria dos casos. Basta colocar os ímanes N55 mais fortes para lidar com as cargas que necessitam da maior densidade de fluxo. Enquanto os ímanes N35, mais económicos, se ocupam de tarefas mais leves.

A temperatura afectará o desempenho ao longo do tempo?

All permanent neodymium magnets will lose strength gradually as temperature increases beyond their maximum rating. For example, N35 magnets operated near but below the 80°C limit will exhibit slightly faster losses than units under 50°C over many heating cycles. Always stay comfortably under max limits.

How are these grades tested and verified?

Reputable magnet suppliers use industry-standard processes to measure magnetic properties. This includes testing pull force with calibrated equipment, taking gauss readings with hall effect probes, and verifying ratings like maximum energy product on hysteresis graph plotters. From raw materials to finished products, quality assurance ensures magnets match specifications before shipping to customers.

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